These are excellent for holding exercise pens in place. They don't seem to rust and hold the pens down well. You really need these if you are going to use the pens.

Pros: Hold pens in place

Cons: none

These are excellent anchors for pens. My foster father found many uses for them. One year I used some to hold down the corners of landscape paper before applying the mulch over top. Very durable and will last a long time.

Pros: excellent anchors

Cons: none

very good for what they are intended to do. The only "but" with these is that if you have a dog that weighs more than 15-20lbs you'll want to give constant supervision, they may be able to knock these right out of the ground.

Pros: solid construction

Cons: need to list breeds on packaging

These are a great accessorie for an exercise pen. They hold it in place so it does not tip over or get moved. Remember you put them there before you try to move the pen. Inexpensive, and effective

Pros: inexpensive, durable, effective

Cons: remember they are there